Thunder | 乾 is developed by AROMA Audio based on the well control of characteristics of dynamic driver and balanced armature driver performance, reflecting the confidence of our development of hybrid IEM for many years. There are 2 kinds of signature sound for Thunder | 乾. It composes of 10 balanced armature drivers and 1 AROMA dynamic driver Breakthrough | 乾坤. The pure copper trap is used to play the bass-like sound effect of the Hi Fi speaker type.

A semi-open mode is used in the design of the IEM shell, which utilizes a venting air flow to create a wide sound field.
The natural mode performs vocal expression expresses strong feelings and has strong appeal. The intermediate frequency has a good rhythm and dynamic cohesion, and the high frequency is clear and transparent.
The bass mode has a good bass dive deeply and extensively, which conveys the strong shock that the music has to express. Our objective is to let Thunder | 乾 have a thunderous feeling in the music.